In the years following the Sept. 11, 2011 terrorist attacks the U.S. Transportation Security Administration increased the list of items that it prohibits on commercial airlines. Although liquids might not seem as dangerous as other prohibited items such as weapons or knives, the TSA strictly regulates the amount of fluid you can carry on a plane.

Amount

The Transportation Security Administration prohibits you from carrying bottles larger than 3.4 ounces in your carry-on luggage or on your person. If you wish to travel with more than 3.4 ounces of fluid, you must transport it in your checked luggage. To be permitted on the airplane, the 3.4 ounce bottle must not contain a fluid that is flammable, such as paint.

Requirements

It you bring 3.4 ounces of fluid on a plane, you must place the bottle in a clear, 1-quart, sealed bag so TSA security screening agents can inspect it.

Exceptions

Once you pass through the security checkpoint at the airport, you're allowed to purchase liquids at the airport stores and take those items on the airplane with you. All items in such stores are approved for commercial airlines, so you can buy a bottle of water, a soft drink or another type of nonalcoholic beverage to enjoy on your flight.

Checked Luggage

The TSA allows travelers to carry more than 3.4 ounces of fluid in their checked luggage. If you wish to travel with bottles of water, juice, soft drinks or alcohol, the TSA does not restrict what you can carry, provided it's in your suitcase. Pack the liquid securely, as its bottle might break when your luggage is handled or during transit.

About the Author

Toronto-based journalist William McCoy has been writing since 1997, specializing in topics such as sports, nutrition and health. He serves as the Studio's sports and recreation section expert. McCoy is a journalism graduate of Ryerson University.